Hitachi Astemo Ltd.

Keihin Corporation

Takuma Kato

Kazunari Kurokawa

Yuta Nakamura

Takeshi Kobayashi

Masahiro Shimada

Takami Suzuki

Akihiro Suzuki

Morifumi Shigemasa

Koji Ikeda

Takayuki Sasanuma

Satoshi Hashino

A voltage transformer includes a magnetic coupling interleaved chopper circuit and a control unit configured to control the magnetic coupling interleaved chopper circuit. The control unit includes a switching frequency setting unit configured to set a switching frequency of the magnetic coupling interleaved chopper circuit on the basis of a state quantity indicating an operation state of the magnetic coupling interleaved chopper circuit and is configured to generate a voltage-transformation gate signal of the switching frequency set by the switching frequency setting unit and to output the generated voltage-transformation gate signal to the magnetic coupling interleaved chopper circuit.

Voltage transformer

A power control unit includes a power device, a heat dissipation member disposed to face the power device with an insulating resin member interposed therebetween, and a plurality of plate-shaped bus bars each of which has one end connected to the power device, in which a plurality of input bus bars connected to an input terminal of the power device are provided as the bus bar, and at least one of the plurality of input bus bars is erected so that a direction along a plate width is aligned with a direction along a normal line of a surface of the heat dissipation member facing the power device, and is disposed with respect to the heat dissipation member with the insulating resin member interposed therebetween.

Power control unit

A power conversion device having a multi-phase converter in which a plurality of chopper circuits each including a switching element and a reactor connected to the switching element are connected in parallel is provided. The power conversion device includes a single current sensor that is provided on a primary side of the chopper circuit, and detects a phase current flowing through each of the reactors when the switching elements are in both an on state and an off state, and a drift current detection unit configured to detect a drift current of a phase current in the multi-phase converter on the basis of the phase current detected by the current sensor, wherein the current sensor detects a phase current such that directions of phase currents flowing through each of the reactors are the same as each other.

Multi-phase power converter with drift current

A power conversion device includes a multiphase power conversion circuit, a plurality of bus bars which are arranged adjacent to each other, phase currents of the multiphase power conversion circuit flowing through the plurality of bus bars, respectively, a single current sensor configured to detect any of the phase currents in the plurality of bus bars, and a housing which houses the multiphase power conversion circuit, the plurality of bus bars and the current sensor, in which the current sensor includes a magnetic core through which the plurality of bus bars are inserted such that flow directions of the phase currents are the same direction, and which has a single magnetic gap, and a Hall element inserted in the magnetic gap.

Power conversion device

Growing community of inventors

Sakura, Japan

Takuma Kato